Uttarakhand Board Class 12 Sample Paper 2023 Chemistry

jksy- ua-

Roll N0

130

Ikzfrn”kZ iz”ui=
2023
jlk;u foKku (lS)kfUrd)
CHEMISTRY (Theory)
Lke; % 3 ?k.Vs] [ iw.kkZad % 70

[ Max Marks : 70

funsZ”k% i) bl iz”ui= esa dqy 28 iz”u gSaAlHkh iz”u vfuok;Z gSa A
ii) iz”u la[;k 1 esa 8 [k.M gSaAizR;sd [k.M cgqfodYih; iz”u gS ftles aizR;sd iz”u ds mRrj esa pkj
fodYi fn, x;s gSAlgh fodYi viuh mRRkj iqfLrdk esa fyf[k,A izR;sd [k.M es aiwNk x;k iz”u ,d
vad dk gS A
iii) iz”u la[;k 2 ls 7 rd izR;sd iz”u 1 vad dk gS A iz”u la[;k 8 ls 17 rd izR;sd iz”u 2 vadkas
dk gS A iz”u la[;k 18 ls 25 rd izR;sd iz”u 3 vad dk gS A iz”u la[;k 26 ls 28 rd izR;sd iz”u
4 vadksa dk gS A
iv) iz”ui= esa lexz esa dksbZ fodYi ugh gS rFkkfi 2 vadks aokys 2 iz”uksa] 3 vadks okys rhu iz”ukss aesa vkSj
4 vadkas okys lHkh iz”uksa es avkUrfjd fodYi iznku fd;k x;k gS A ,sls iz”uks aes adsoy ,d fodYi dk
gh mRrj nhft,A
v) dSydqysVj ds mi;ksx dh vuqefr ugh gS A
Note: (i) There are in all 28 questions in this question paper. All questions are
compulsory.
(ii) There are 8 parts in Question No 1. Each part is a Multiple Choice Question.
Here four options are given in each question. Write the correct option in your
answer book.The question asked in each section carries one mark
(iii) Question No 2 to 7 carry one mark each. Question No 8 to 17 carry two marks
each. Question No 18 to 25 carry three marks each and Question No 26 to 28
carry four marks each.
(iv) There is no overall choice in Question paper, however an internal choice has
been provided in two questions of 2 marks, three questions of 3 marks and all
questions of 4 marks each. You have to attempt only one of the given choices in
such questions.
(v) Use of calculator is not permitted.
1 (i) nw/k mnkgj.k gS& 1
Milk is an example of-
(a) tsy dk (b) ik;l dk (c) okLrfod foy;u dk (d) >kx dk
Gel Emulsion True Solution Foam
(ii) dkij ik;jkbV dk lw= gS& 1
Formula of Copper Pyrite is –
(a) CuFeS (b) CuFeS2 (c) Cu2S (d) Cu2FeS2

(iii) isfuflyhu gS& 1
Penicillin is-
(a)izfrfo’kjks/kd (b)ihM+kgkjh (c)Tojjks/kh (d)izfrtSfod
Antiseptic Analgesic Antipyretic Antibiotic
(iv) izkd`frd jcj] cgqyd gS& 1
Natural Rubber is polymer of-
(a) ,dzkbfyd vEy dk (b)vkblksizhu dk (c) ,Fkhu dk (d) csUthu dk
Acrylic Acid Isoprene Ethene Benzene
(v) foVkfeu D dk jklk;fud uke gS& 1
Chemical name of Vitamin D is-
(a)Xywdkst (b) QzqDVkst (c) dSYlhQsjksy (d) jkbcksQ~ysfou
Glucose Fructose Calciferol Riboflevin
(vi) fuEu es als dkSu Qsgfyax foy;u dks vipf;r djrk gS& 1
Among the following, which one reduces Fehling solution-
(a) ,lhfVd vEy (b)csUtksbd vEy (c)vkDlfyd vEy (d)QkfeZd vEy
Acetic Acid Benzoic Acid Oxalic Acid Formic Acids
(vii) Xywdkst dks ,fFky ,YdksgkWy esa ifjofrZr fd;k tkrk gS& 1
Glucose is converted into ethyl alcohol by-
(a)bUoVsZl ls (b)bEyflu ls (c)tkbesl ls (d)ekYVst ls
Invertase Emulsin Zymase Maltase
(viii) fuEu esa ls dkSulk v.kqla[; xq.k/keZ gS& 1
From the following which show colligative property-
(a)“;kurk (b)i`’B ruko (c)izdkf”kd ?kw.kZu (d)ijklj.k nkc
Viscosity Surface Tension Optical Rotation Osmatic Pressure

2. milgla;kstu la[;k ls D;k vfHkizk; gS \ 1
What is meant by coordination number?
3. fuEufyf[kr dks {kkjdrk ds c<+rs dze esa O;ofLFkr dhft,& 1
Arrange the following in the order of their increasing basic character-
NH3, C2H5NH2, (C2H5)2NH, (C2H5)3N
4. fuEufyf[kr dk dkj.k Li’V dhft,& 1
Explain the following facts-
NH3 gkbMªkstu cU/k cukrh gS ijUrq PH3 ugh cukrh A
NH3 forms Hydrogen bond but PH3 does not.

5- fuEufyf[kr vfHkfØ;k dks iw.kZ dhft,& 1
Complete the following reaction-

R- COOH (i) LiAlH4/ ether ?
+
(ii) H3O
6% çFke dksfV vfHkfØ;k dhs v)Zvk;q dks Li’V dhft,A 1
Clarify half life period of first order reaction.
7% foy;u ds ijklj.k nkc ls D;k rkRi;Z gS\ 1
What is meant by osmotic pressure of solution?
8% fuEu dks cukus ds fy, jklk;fud vfHkfØ;k,s fyf[k,& 2
Write chemical reaction to prepare the following-
¼d½ DyksjkscsUthu ls Mh0Mh0Vh0 ¼[k½ dkcZu VsVªkDyksjkbM ls QzsvkWu&12
DDT from Chlorobenzene Freon -12 from Carbon Tetrachloride
9% d`f=e e/kqjd D;k gS\ lSdjhu dk lajpukRed lw= fyf[k,& 2
What are artificial sweetening agents? Write the structural formula of
Saccharine.
10. IUPAC fu;eksa ds vk/kkj ij fuEu ds lqO;ofLFkr uke fyf[k,& 1+1= 2
Using IUPAC nomenclature, write the systematic names of the following-
¼d½ K4 Fe (CN)6 ¼[k½ [Cu(NH3)4] SO4
11% QsuIyou fof/k ls v;Ldksa dk lkUnz.k dSls fd;k tkrk gS\ 2
How concentration of ores is done by froth floatation method?
12% fuEufyf[ke lsy ds fy, 298K ij oS|qr okgd cy ¼e.m.f.½ dh x.kuk dhft,&
2
2+ +
Zn/ Zn (0.01 M ) 11Ag (1.0 M)/ Ag
298 K ij E0cell = 1.56 V
Calculate e.m.f of the cell at 298 K
vFkok (OR)
fdlh oS|qr vi?kV~; foy;u dh pkydrk rFkk eksyj pkydrk dh ifjHkk’kk nhft, A
Define Conductivity and Molar Conductivity of electrolyte solution.
13% ,d rRo dh lajpuk var% dsfUnzr ?kuh; ¼bcc½ gS o bldh dksf’Bdk ds dksj dh yEckbZ 288
pm gSA rRo dk ?kuRo 7.2 gm/cm3S gSA bl rRo ds 208 gm esa fdrus ijek.kq mifLFkr gS\
2
The structure of an element is body centered cubic ¼bcc½ and its cell edge is
288 pm.The density of the element is 7.2 gm/ cm3 . How many atoms are
present is 208 gm of this element?
14%fuEufyf[kr cgqydksa dks çkIr djus ds fy, ç;qDr ,dydksa dks fyf[k,&
1+1= 2

Write the monomers used for getting the following polymers-
¼d½ fXyIVy ¼Glyptal) ¼[k½ CkSdsykbV (Bakelite)

15% fØLVy tkyd rFkk ,dd dksf’Bdk dks le>kb,A 2
Explain crystal lattice and unit cell.

vFkok (OR)
“kkWVdh nks’k rFkk Qzasdsy nks’k dks le>kb, A
Explain Schottky defect and Frenkel defect.
16% VªkbDyksjksesFksu dks xgjh jaxhu cksryksa esa D;ksa laxzghr djrs gSa \ lEcfU/kr vfHkfØ;k crkrs gq,
dkj.k nhft,A 2
Why does Trichloromethane store in dark coloured bottles? Give reason
with related reaction.
17% ySUFksukW;M vkdqapu D;k gS\ ySUFksuk¡;M vkdqapu ds ifj.kke D;k gS\ 2
What is Lanthanoid contraction? What are the consequences of Lanthanoid
contraction?
18% ,d inkFkZ ds 10 xzke dks 100 xzke foyk;d esa ?kksyus ij DoFkukad esa 10C dh o`f) ik;h
tkrh gSA inkFkZ ds v.kqHkkj dh x.kuk dhft,A 3
-1
[foyk;d gsrq Kb= 2.53K kg mol ]
When 10gm of a substance was dissolved in 100gm solvent, observed
elevation in boiling point was 10C. Calculate the molecular weight of the
substance. [Kb for solvent is = 2.53 K kg mol-1]

19% HCl, NaCl rFkk CH3COONa ds fy, Λ0m ds eku Øe”k% 426-1] 126-5 rFkk 91-0
mho cm2 mol-1 gSA CH3COOH ds fy, Λ0m ds eku dh x.kuk dhft,A 3
Λ m of HCl, NaCl and CH3COONa are 426.1, 126.5 and 91.0 mho
0

cm2 mol-1 respectively. Calculate Λ0m for CH3COOH.
20% fVIi.kh fyf[k,& ¼d½ ik;lhdj.k ¼[k½ LdUnu ¼x½ fV.My çHkko 1+1+1=3
Write short notes – (a) Emulsification (b) Coagulation (c) Tyndall effect
vFkok (OR)
¼d½gkMhZ&“kqYts dk fu;e crkb;s A 1
State Hardy-Schulze rule.
¼[k½ Qsfjd gkbMªkDlkbM ds dksykbMh foy;u esa lksfM;e DyksjkbM foy;u feykus ij LdUnu
gks tkrk gS] D;ksa\ 1
Coagulation takes place when Sodium Chloride solution is added to Colloidal
solution of Ferric Hydroxide, why?
21- gkoj çØe }kjk veksfu;k ds fuekZ.k dk lfp= o.kZu dhft,A 3

Describe the manufacture of Ammonia by the Haber’s process with diagram.
vFkok (OR)
vksLVokYM izdze ls ukbfVªd ,flM ds fuekZ.k dh fof/k jklk;fud vfHkfdz;kvksa lfgr fyf[k,A
Write method of preparation of Nitric Acid by Ostwald’s process with
chemical reactions.
22% fuEufyf[kr ds lanHkZ esa ,fDVuk¡;M Js.kh ds rRoksa rFkk ySUFkksuk¡;M Js.kh ds rRoksa ds jlk;u
dh rqyuk dhft,& 3
Compare the chemistry of the Actinoids with that of Lanthanoids with
reference to-
(i) bysDVª¡kfud foU;kl (ii) vkDlhdj.k voLFkk (iii) jklk;fud vfHkfØ;k”khyrk
Electronic configuration Oxidation states Chemical reactivity
23% çkFkfed] f}rh;d vkSj r`rh;d ,Ydksgk¡y D;k gksrs gSa \ D;k gksrk gS tc çkFkfed] f}rh;d
vkSj r`rh;d ,YdksgkWy 570 K ij xeZ dkWij ij çHkkfor fd;s tkrs gSaA 3
What are primary, secondary and tertiary alcohol? What happens when
primary, secondary, and tertiary alcohol are passed over heated copper at
5700K.
24% fuEu vfHkfØ;kvksa dks le>kb,s& 3
Explain the following reaction-
¼d½ dkfcZyk ,ehu vfHkfØ;k
Carbyl Amine reaction
¼[k½ Mkb,tksdj.k
Diazotization
¼x½ gkQeSu czkse&,ekbM vfHkfdz;k
Hoffman Brom-amide reaction
25% Xywdkst esa ,fYMgkbM rFkk ik¡p gkbMªk¡fDly lewgksa dh mifLFkfr çnf”kZr djus gsrq
vfHkyk{kf.kd vfHkfØ;k,sa fyf[k,A 3
Write the characteristic reactions of glucose which indicate the presence of
aldehyde and five hydroxyl group in it.
vFkok (OR)
¼d½ ,sehuks vEyksa dh mHk;/kehZ izd`fr dks vki dSls le>k;saxs \ 1
How do you explain ampotheric behavior of amino acids?
¼[k½ DNA rFkk RNA ds tSfod dk;Z le>kb, A 2
Explain Biological functions of DNA and RNA.
26%¼d½ çFke dksfV vfHkfØ;k ds fy, vfHkdkjd ds çkjfEHkd lkUnz.k o v)Zvk;qdky esa D;k
lEcU/k gSA 2
What is the relation between initial concentration of the reactant and
half life time for first order reaction.
¼[k½ vfHkfØ;k ds osx ij lkUnz.k] rki] nkc o mRçsjd dk çHkko le>kb,sA 2

Explain the effect of concentration, temperature, pressure and catalyst
on reaction rate.
vFkok ¼OR½
¼d½ “kwU; dksfV dh vfHkfØ;k ds fy, osx lehdj.k dh O;qRifRr dhft,A 2
Deduce the rate equation for a zero order reaction.
¼[k½ H2O2 ds fo?kVu dh cyxfrdh dk v/;;u fdl çdkj fd;k tkrk gSA
2
How the study of kinetics is made for decomposition of H2O2?
27% ¼d½ laLi”kZ çØe }kjk H2SO4 ds mRiknu dk lfp= o.kZu dhft,A 2
Explain the manufacture of H2SO4 by contact process with the help of
diagram
¼[k½ XeF2 rFkk XeF4 dh lajpuk,sa fyf[k,A 2
Write structure of XeF2 and XeF4.
vFkok ¼OR½
fuEufyf[kr ds dkj.k Li’V dhft,& 4
Explain the reasons for the following.
¼d½ mRd`’V xSlks ds DoFkukad cgqr de gSaA
Noble gases have very low boiling point.
¼[k½ Mkbvk¡Dlhtu ,d xSl gS tcfd lYQj ,d Bksl gSA
Dioxygen is a gas but sulphur a solid.
¼x½ gSykstu izcy vkDlhdkjd gksrs gSaA
Halogens are strong Oxidising agents.
¼?k½ PCl5 Kkr gS ij NCl5 ughA
PCl5 is known but NCl5 is not.
28% ,d dkcZfud ;kSfxd [A] ftldk v.kqlw= C3H6O gS] vk;MksQkeZ vfHkfØ;k nsrk gS vkSj
;kSfxd [B] cukrk gSA ;kSfxd [B] pkWnh ds pw.kZ ds lkFk xeZ djus ij ;kSfxd [C] esa cny
tkrk gSA ;kSfxd [C] dh vfHkfØ;k ruq lY¶;qfjd vEy o eDZ;wfjd lY¶QsV ls djus ij ;kSfxd
[D] çkIr gksrk gS] tks ,YMksy la?kuu vfHkfØ;k nsrk gSA ;kSfxd [A] ls [D] rd lHkh ds uke
fyf[k,] rFkk çR;sd in ds ifjorZu ds fy, jklk;fud lehdj.k fyf[k,A 4
An organic compound [A] whose molecular formula is C3H6O gives
Iodoform reaction and forms compound [B], Compound [B] when heated with
silver powder, converts in to compound [C]. Compound [C] reacts with dilute
Sulphuric acid and Mercuric sulphate to obtain compound [D] ,which gives
Aldol condensation reaction. Write down the name of all compounds from [A]
to [D] and write chemical equations for each step.
vFkok ¼OR½
fuEu vfHkfØ;kvksa dks jklk;fud lehdj.k lfgr fyf[k,A 1x4=4

Write the following reactions with chemical equations.
¼d½ dSfutkjks vfHkfØ;k ¼[k½ ,YMksy la?kuu
(Cannizzaro reaction) (Aldol condensation)
¼x½ ,LVhdj.k ¼?k½ gsyQksykMZ&tsfyaLdh vfHkfØ;k
(Esterification) (Hell-Volhard –Zelinskey reaction)